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On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

A. Involves no change in volume

B. Takes place at constant temperature

C. Takes place at constant entropy

D. Takes place at constant pressure

Correct Answer : D.


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  2. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine…
  3. In a psychrometric chart, specific humidity (moisture content) lines are
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  5. The COP of a domestic refrigerator
  6. The undesirable property of a refrigerant is
  7. The condition of refrigerant as it leaves the compressor in a vapour compression system is
  8. Superheating in a refrigeration cycle
  9. In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature
  10. In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)
  11. In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering…
  12. The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in…
  13. The fluids used in Electrolux refrigerator are
  14. The advantage of dry compression is that
  15. The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate…
  16. Allowable pressure on high pressure side or ammonia absorption system is of the order of
  17. The wet bulb depression indicates _________ humidity of the air.
  18. Choose the wrong statement
  19. The lowest thermal diffusivity is of
  20. Moisture should be removed from refrigerants to avoid
  21. The conditioned air supplied to the room must have the capacity to take up
  22. Which of the following refrigerant is highly toxic and flammable?
  23. Carbon dioxide is
  24. One tonne of refrigeration (1TR) means that the heat removing capacity is
  25. In chemical dehumidification process,
  26. In a bootstrap air evaporative cooling system, the evaporator is provided
  27. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature…
  28. Which of the following is not a desirable property of a refrigerant?
  29. The evaporator changes the low pressure liquid refrigerant from the expansion valve into
  30. The higher temperature in vapour compression cycle occurs at